1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)fs.h 8.13 (Berkeley) 03/21/95 8 */ 9 10 /* 11 * Each disk drive contains some number of file systems. 12 * A file system consists of a number of cylinder groups. 13 * Each cylinder group has inodes and data. 14 * 15 * A file system is described by its super-block, which in turn 16 * describes the cylinder groups. The super-block is critical 17 * data and is replicated in each cylinder group to protect against 18 * catastrophic loss. This is done at `newfs' time and the critical 19 * super-block data does not change, so the copies need not be 20 * referenced further unless disaster strikes. 21 * 22 * For file system fs, the offsets of the various blocks of interest 23 * are given in the super block as: 24 * [fs->fs_sblkno] Super-block 25 * [fs->fs_cblkno] Cylinder group block 26 * [fs->fs_iblkno] Inode blocks 27 * [fs->fs_dblkno] Data blocks 28 * The beginning of cylinder group cg in fs, is given by 29 * the ``cgbase(fs, cg)'' macro. 30 * 31 * The first boot and super blocks are given in absolute disk addresses. 32 * The byte-offset forms are preferred, as they don't imply a sector size. 33 */ 34 #define BBSIZE 8192 35 #define SBSIZE 8192 36 #define BBOFF ((off_t)(0)) 37 #define SBOFF ((off_t)(BBOFF + BBSIZE)) 38 #define BBLOCK ((ufs_daddr_t)(0)) 39 #define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) 40 41 /* 42 * Addresses stored in inodes are capable of addressing fragments 43 * of `blocks'. File system blocks of at most size MAXBSIZE can 44 * be optionally broken into 2, 4, or 8 pieces, each of which is 45 * addressible; these pieces may be DEV_BSIZE, or some multiple of 46 * a DEV_BSIZE unit. 47 * 48 * Large files consist of exclusively large data blocks. To avoid 49 * undue wasted disk space, the last data block of a small file may be 50 * allocated as only as many fragments of a large block as are 51 * necessary. The file system format retains only a single pointer 52 * to such a fragment, which is a piece of a single large block that 53 * has been divided. The size of such a fragment is determinable from 54 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. 55 * 56 * The file system records space availability at the fragment level; 57 * to determine block availability, aligned fragments are examined. 58 */ 59 60 /* 61 * MINBSIZE is the smallest allowable block size. 62 * In order to insure that it is possible to create files of size 63 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. 64 * MINBSIZE must be big enough to hold a cylinder group block, 65 * thus changes to (struct cg) must keep its size within MINBSIZE. 66 * Note that super blocks are always of size SBSIZE, 67 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 68 */ 69 #define MINBSIZE 4096 70 71 /* 72 * The path name on which the file system is mounted is maintained 73 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 74 * the super block for this name. 75 */ 76 #define MAXMNTLEN 512 77 78 /* 79 * The limit on the amount of summary information per file system 80 * is defined by MAXCSBUFS. It is currently parameterized for a 81 * size of 128 bytes (2 million cylinder groups on machines with 82 * 32-bit pointers, and 1 million on 64-bit machines). One pointer 83 * is taken away to point to an array of cluster sizes that is 84 * computed as cylinder groups are inspected. 85 */ 86 #define MAXCSBUFS ((128 / sizeof(void *)) - 1) 87 88 /* 89 * A summary of contiguous blocks of various sizes is maintained 90 * in each cylinder group. Normally this is set by the initial 91 * value of fs_maxcontig. To conserve space, a maximum summary size 92 * is set by FS_MAXCONTIG. 93 */ 94 #define FS_MAXCONTIG 16 95 96 /* 97 * MINFREE gives the minimum acceptable percentage of file system 98 * blocks which may be free. If the freelist drops below this level 99 * only the superuser may continue to allocate blocks. This may 100 * be set to 0 if no reserve of free blocks is deemed necessary, 101 * however throughput drops by fifty percent if the file system 102 * is run at between 95% and 100% full; thus the minimum default 103 * value of fs_minfree is 5%. However, to get good clustering 104 * performance, 10% is a better choice. hence we use 10% as our 105 * default value. With 10% free space, fragmentation is not a 106 * problem, so we choose to optimize for time. 107 */ 108 #define MINFREE 5 109 #define DEFAULTOPT FS_OPTTIME 110 111 /* 112 * Per cylinder group information; summarized in blocks allocated 113 * from first cylinder group data blocks. These blocks have to be 114 * read in from fs_csaddr (size fs_cssize) in addition to the 115 * super block. 116 * 117 * N.B. sizeof(struct csum) must be a power of two in order for 118 * the ``fs_cs'' macro to work (see below). 119 */ 120 struct csum { 121 int32_t cs_ndir; /* number of directories */ 122 int32_t cs_nbfree; /* number of free blocks */ 123 int32_t cs_nifree; /* number of free inodes */ 124 int32_t cs_nffree; /* number of free frags */ 125 }; 126 127 /* 128 * Super block for an FFS file system. 129 */ 130 struct fs { 131 int32_t fs_firstfield; /* historic file system linked list, */ 132 int32_t fs_unused_1; /* used for incore super blocks */ 133 ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */ 134 ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */ 135 ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ 136 ufs_daddr_t fs_dblkno; /* offset of first data after cg */ 137 int32_t fs_cgoffset; /* cylinder group offset in cylinder */ 138 int32_t fs_cgmask; /* used to calc mod fs_ntrak */ 139 time_t fs_time; /* last time written */ 140 int32_t fs_size; /* number of blocks in fs */ 141 int32_t fs_dsize; /* number of data blocks in fs */ 142 int32_t fs_ncg; /* number of cylinder groups */ 143 int32_t fs_bsize; /* size of basic blocks in fs */ 144 int32_t fs_fsize; /* size of frag blocks in fs */ 145 int32_t fs_frag; /* number of frags in a block in fs */ 146 /* these are configuration parameters */ 147 int32_t fs_minfree; /* minimum percentage of free blocks */ 148 int32_t fs_rotdelay; /* num of ms for optimal next block */ 149 int32_t fs_rps; /* disk revolutions per second */ 150 /* these fields can be computed from the others */ 151 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */ 152 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */ 153 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */ 154 int32_t fs_fshift; /* ``numfrags'' calc number of frags */ 155 /* these are configuration parameters */ 156 int32_t fs_maxcontig; /* max number of contiguous blks */ 157 int32_t fs_maxbpg; /* max number of blks per cyl group */ 158 /* these fields can be computed from the others */ 159 int32_t fs_fragshift; /* block to frag shift */ 160 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 161 int32_t fs_sbsize; /* actual size of super block */ 162 int32_t fs_csmask; /* csum block offset */ 163 int32_t fs_csshift; /* csum block number */ 164 int32_t fs_nindir; /* value of NINDIR */ 165 int32_t fs_inopb; /* value of INOPB */ 166 int32_t fs_nspf; /* value of NSPF */ 167 /* yet another configuration parameter */ 168 int32_t fs_optim; /* optimization preference, see below */ 169 /* these fields are derived from the hardware */ 170 int32_t fs_npsect; /* # sectors/track including spares */ 171 int32_t fs_interleave; /* hardware sector interleave */ 172 int32_t fs_trackskew; /* sector 0 skew, per track */ 173 int32_t fs_headswitch; /* head switch time, usec */ 174 int32_t fs_trkseek; /* track-to-track seek, usec */ 175 /* sizes determined by number of cylinder groups and their sizes */ 176 ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ 177 int32_t fs_cssize; /* size of cyl grp summary area */ 178 int32_t fs_cgsize; /* cylinder group size */ 179 /* these fields are derived from the hardware */ 180 int32_t fs_ntrak; /* tracks per cylinder */ 181 int32_t fs_nsect; /* sectors per track */ 182 int32_t fs_spc; /* sectors per cylinder */ 183 /* this comes from the disk driver partitioning */ 184 int32_t fs_ncyl; /* cylinders in file system */ 185 /* these fields can be computed from the others */ 186 int32_t fs_cpg; /* cylinders per group */ 187 int32_t fs_ipg; /* inodes per group */ 188 int32_t fs_fpg; /* blocks per group * fs_frag */ 189 /* this data must be re-computed after crashes */ 190 struct csum fs_cstotal; /* cylinder summary information */ 191 /* these fields are cleared at mount time */ 192 int8_t fs_fmod; /* super block modified flag */ 193 int8_t fs_clean; /* file system is clean flag */ 194 int8_t fs_ronly; /* mounted read-only flag */ 195 int8_t fs_flags; /* currently unused flag */ 196 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 197 /* these fields retain the current block allocation info */ 198 int32_t fs_cgrotor; /* last cg searched */ 199 struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ 200 int32_t *fs_maxcluster; /* max cluster in each cyl group */ 201 int32_t fs_cpc; /* cyl per cycle in postbl */ 202 int16_t fs_opostbl[16][8]; /* old rotation block list head */ 203 int32_t fs_sparecon[50]; /* reserved for future constants */ 204 int32_t fs_contigsumsize; /* size of cluster summary array */ 205 int32_t fs_maxsymlinklen; /* max length of an internal symlink */ 206 int32_t fs_inodefmt; /* format of on-disk inodes */ 207 u_int64_t fs_maxfilesize; /* maximum representable file size */ 208 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */ 209 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */ 210 int32_t fs_state; /* validate fs_clean field */ 211 int32_t fs_postblformat; /* format of positional layout tables */ 212 int32_t fs_nrpos; /* number of rotational positions */ 213 int32_t fs_postbloff; /* (u_int16) rotation block list head */ 214 int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */ 215 int32_t fs_magic; /* magic number */ 216 u_int8_t fs_space[1]; /* list of blocks for each rotation */ 217 /* actually longer */ 218 }; 219 220 /* 221 * Filesystem identification 222 */ 223 #define FS_MAGIC 0x011954 /* the fast filesystem magic number */ 224 #define FS_OKAY 0x7c269d38 /* superblock checksum */ 225 #define FS_42INODEFMT -1 /* 4.2BSD inode format */ 226 #define FS_44INODEFMT 2 /* 4.4BSD inode format */ 227 /* 228 * Preference for optimization. 229 */ 230 #define FS_OPTTIME 0 /* minimize allocation time */ 231 #define FS_OPTSPACE 1 /* minimize disk fragmentation */ 232 233 /* 234 * Rotational layout table format types 235 */ 236 #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ 237 #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ 238 /* 239 * Macros for access to superblock array structures 240 */ 241 #define fs_postbl(fs, cylno) \ 242 (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 243 ? ((fs)->fs_opostbl[cylno]) \ 244 : ((int16_t *)((u_int8_t *)(fs) + \ 245 (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) 246 #define fs_rotbl(fs) \ 247 (((fs)->fs_postblformat == FS_42POSTBLFMT) \ 248 ? ((fs)->fs_space) \ 249 : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff))) 250 251 /* 252 * The size of a cylinder group is calculated by CGSIZE. The maximum size 253 * is limited by the fact that cylinder groups are at most one block. 254 * Its size is derived from the size of the maps maintained in the 255 * cylinder group and the (struct cg) size. 256 */ 257 #define CGSIZE(fs) \ 258 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \ 259 /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \ 260 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \ 261 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 262 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\ 263 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ 264 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \ 265 /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY))) 266 267 /* 268 * Convert cylinder group to base address of its global summary info. 269 * 270 * N.B. This macro assumes that sizeof(struct csum) is a power of two. 271 */ 272 #define fs_cs(fs, indx) \ 273 fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] 274 275 /* 276 * Cylinder group block for a file system. 277 */ 278 #define CG_MAGIC 0x090255 279 struct cg { 280 int32_t cg_firstfield; /* historic cyl groups linked list */ 281 int32_t cg_magic; /* magic number */ 282 time_t cg_time; /* time last written */ 283 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 284 int16_t cg_ncyl; /* number of cyl's this cg */ 285 int16_t cg_niblk; /* number of inode blocks this cg */ 286 int32_t cg_ndblk; /* number of data blocks this cg */ 287 struct csum cg_cs; /* cylinder summary information */ 288 int32_t cg_rotor; /* position of last used block */ 289 int32_t cg_frotor; /* position of last used frag */ 290 int32_t cg_irotor; /* position of last used inode */ 291 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */ 292 int32_t cg_btotoff; /* (int32) block totals per cylinder */ 293 int32_t cg_boff; /* (u_int16) free block positions */ 294 int32_t cg_iusedoff; /* (u_int8) used inode map */ 295 int32_t cg_freeoff; /* (u_int8) free block map */ 296 int32_t cg_nextfreeoff; /* (u_int8) next available space */ 297 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */ 298 int32_t cg_clusteroff; /* (u_int8) free cluster map */ 299 int32_t cg_nclusterblks; /* number of clusters this cg */ 300 int32_t cg_sparecon[13]; /* reserved for future use */ 301 u_int8_t cg_space[1]; /* space for cylinder group maps */ 302 /* actually longer */ 303 }; 304 305 /* 306 * Macros for access to cylinder group array structures 307 */ 308 #define cg_blktot(cgp) \ 309 (((cgp)->cg_magic != CG_MAGIC) \ 310 ? (((struct ocg *)(cgp))->cg_btot) \ 311 : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff))) 312 #define cg_blks(fs, cgp, cylno) \ 313 (((cgp)->cg_magic != CG_MAGIC) \ 314 ? (((struct ocg *)(cgp))->cg_b[cylno]) \ 315 : ((int16_t *)((u_int8_t *)(cgp) + \ 316 (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) 317 #define cg_inosused(cgp) \ 318 (((cgp)->cg_magic != CG_MAGIC) \ 319 ? (((struct ocg *)(cgp))->cg_iused) \ 320 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff))) 321 #define cg_blksfree(cgp) \ 322 (((cgp)->cg_magic != CG_MAGIC) \ 323 ? (((struct ocg *)(cgp))->cg_free) \ 324 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff))) 325 #define cg_chkmagic(cgp) \ 326 ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) 327 #define cg_clustersfree(cgp) \ 328 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff)) 329 #define cg_clustersum(cgp) \ 330 ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff)) 331 332 /* 333 * The following structure is defined 334 * for compatibility with old file systems. 335 */ 336 struct ocg { 337 int32_t cg_firstfield; /* historic linked list of cyl groups */ 338 int32_t cg_unused_1; /* used for incore cyl groups */ 339 time_t cg_time; /* time last written */ 340 int32_t cg_cgx; /* we are the cgx'th cylinder group */ 341 int16_t cg_ncyl; /* number of cyl's this cg */ 342 int16_t cg_niblk; /* number of inode blocks this cg */ 343 int32_t cg_ndblk; /* number of data blocks this cg */ 344 struct csum cg_cs; /* cylinder summary information */ 345 int32_t cg_rotor; /* position of last used block */ 346 int32_t cg_frotor; /* position of last used frag */ 347 int32_t cg_irotor; /* position of last used inode */ 348 int32_t cg_frsum[8]; /* counts of available frags */ 349 int32_t cg_btot[32]; /* block totals per cylinder */ 350 int16_t cg_b[32][8]; /* positions of free blocks */ 351 u_int8_t cg_iused[256]; /* used inode map */ 352 int32_t cg_magic; /* magic number */ 353 u_int8_t cg_free[1]; /* free block map */ 354 /* actually longer */ 355 }; 356 357 /* 358 * Turn file system block numbers into disk block addresses. 359 * This maps file system blocks to device size blocks. 360 */ 361 #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) 362 #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) 363 364 /* 365 * Cylinder group macros to locate things in cylinder groups. 366 * They calc file system addresses of cylinder group data structures. 367 */ 368 #define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c))) 369 #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ 370 #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ 371 #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ 372 #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ 373 #define cgstart(fs, c) \ 374 (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) 375 376 /* 377 * Macros for handling inode numbers: 378 * inode number to file system block offset. 379 * inode number to cylinder group number. 380 * inode number to file system block address. 381 */ 382 #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) 383 #define ino_to_fsba(fs, x) \ 384 ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ 385 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) 386 #define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) 387 388 /* 389 * Give cylinder group number for a file system block. 390 * Give cylinder group block number for a file system block. 391 */ 392 #define dtog(fs, d) ((d) / (fs)->fs_fpg) 393 #define dtogd(fs, d) ((d) % (fs)->fs_fpg) 394 395 /* 396 * Extract the bits for a block from a map. 397 * Compute the cylinder and rotational position of a cyl block addr. 398 */ 399 #define blkmap(fs, map, loc) \ 400 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) 401 #define cbtocylno(fs, bno) \ 402 ((bno) * NSPF(fs) / (fs)->fs_spc) 403 #define cbtorpos(fs, bno) \ 404 (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ 405 (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ 406 (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) 407 408 /* 409 * The following macros optimize certain frequently calculated 410 * quantities by using shifts and masks in place of divisions 411 * modulos and multiplications. 412 */ 413 #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ 414 ((loc) & (fs)->fs_qbmask) 415 #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ 416 ((loc) & (fs)->fs_qfmask) 417 #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ 418 ((blk) << (fs)->fs_bshift) 419 #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ 420 ((loc) >> (fs)->fs_bshift) 421 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 422 ((loc) >> (fs)->fs_fshift) 423 #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ 424 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) 425 #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ 426 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) 427 #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ 428 ((frags) >> (fs)->fs_fragshift) 429 #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ 430 ((blks) << (fs)->fs_fragshift) 431 #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ 432 ((fsb) & ((fs)->fs_frag - 1)) 433 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ 434 ((fsb) &~ ((fs)->fs_frag - 1)) 435 436 /* 437 * Determine the number of available frags given a 438 * percentage to hold in reserve. 439 */ 440 #define freespace(fs, percentreserved) \ 441 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ 442 (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) 443 444 /* 445 * Determining the size of a file block in the file system. 446 */ 447 #define blksize(fs, ip, lbn) \ 448 (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 449 ? (fs)->fs_bsize \ 450 : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) 451 #define dblksize(fs, dip, lbn) \ 452 (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ 453 ? (fs)->fs_bsize \ 454 : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) 455 456 /* 457 * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte 458 * sector size. 459 */ 460 #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) 461 #define NSPF(fs) ((fs)->fs_nspf) 462 463 /* 464 * Number of inodes in a secondary storage block/fragment. 465 */ 466 #define INOPB(fs) ((fs)->fs_inopb) 467 #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) 468 469 /* 470 * Number of indirects in a file system block. 471 */ 472 #define NINDIR(fs) ((fs)->fs_nindir) 473 474 extern int inside[], around[]; 475 extern u_char *fragtbl[]; 476